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Any variations in the waste heat temperature, mass flow rate or cooling water temperature will definitely have a significant impact on the operation of the proposed ORC system. This influence is examined in the next section through sensitivity analysis of the proposed ORC system. 6.6 Sensitivity Analysis of the Proposed ORC System Real systems are always influenced by variations in some of the plant operating parameters. These variations usually cause disturbance in the plant operating conditions and hence make plant performance deviate from the nominal design conditions. In the case of this project, there are three major operating conditions which will likely influence the plant performance. They include: changes in the waste heat temperature and mass flow rate, as well as changes in the cooling water temperature (ambient conditions). In order to carry out this sensitivity analysis to reflect real plant conditions, it is assumed that the plant is designed, fabricated and commissioned based on the nominal (base load) design point parameters (Aneke et al., 2011b). Based on this assumption, some of the plant’s operating parameters were fixed at the same as that of the nominal (base load) design point. Using the base design operating conditions, all the components of the plant were fixed in size using the approach proposed by Price and Hassani (2002). This was achieved by fixing the pinch point temperature of the heat exchangers at the same value as that of the base load (Price and Hassani, 2002), as well as fixing the isentropic and mechanical efficiency of the turbine at the same value as that of the base load condition (Aneke et al., 2011b). 135

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